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Journal of Clinical Microbiology, 04 1997, 843-846, Vol 35, No. 4
Copyright © 1997 by the American Society for Microbiology. All rights reserved.

Molecular fingerprinting of Mycobacterium tuberculosis on a Caribbean island with IS6110 and DRr probes

C Sola, L Horgen, KS Goh and N Rastogi
Unite de la Tuberculose et des Mycobacteries, Institut Pasteur, Pointe a Pitre, Guadeloupe, French West Indies.

Because of a substantial increase in human immunodeficiency virus (HIV) infection and HIV-linked tuberculosis in the Caribbean, a molecular fingerprinting study of clinical isolates of Mycobacterium tuberculosis isolated at the Pasteur Institute of Guadeloupe from 1994 to 1995 was undertaken with the insertion sequence IS6110 and the direct repeat DRr probes. We present the results for 72 isolates from 51 patients. A major cluster (cluster A) representing isolates from 12 patients (24%) was detected upon PvuII-IS6110 fingerprinting, which revealed a pattern of four bands among these isolates. Homogeneity was retained when the isolates were further analyzed with the DRr probe or further characterized by AluI and SmaI-DRr restriction fragment length polymorphism analysis. The isolates of cluster A, from 10 men and 2 women, was present in people of all ages and of different ethnic and geographical backgrounds, and infection with these isolates was independent of the HIV status of the patients (except for 2 HIV- positive patients from the same ward from whom the tubercle bacilli were isolated at the same time). The percentage of reactivation versus active transmission events could not be precisely determined in this study. These results are discussed on the basis of the genetic advantage of predominant clusters and/or specific characteristics of the settings from which a similar cluster of isolates with four bands has so far been reported, which include South Africa, French Polynesia, and Guadeloupe.

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